123245 has 6 divisors (see below), whose sum is σ = 148842. Its totient is φ = 97968.

The previous prime is 123239. The next prime is 123259. The reversal of 123245 is 542321.

It can be written as a sum of positive squares in 3 ways, for example, as 1444 + 121801 = 38^2 + 349^2 .

It is not a de Polignac number, because 123245 - 2^{4} = 123229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 707 + ... + 863.

It is an arithmetic number, because the mean of its divisors is an integer number (24807).

123245 is a Friedman number, since it can be written as 5*(314/2)^2, using all its digits and the basic arithmetic operations.

2^{123245} is an apocalyptic number.

It is an amenable number.

123245 is a deficient number, since it is larger than the sum of its proper divisors (25597).

123245 is an frugal number, since it uses more digits than its factorization.

123245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 162 counting only the distinct ones).

The product of its digits is 240, while the sum is 17.

The square root of 123245 is about 351.0626724675. The cubic root of 123245 is about 49.7648962573.

Adding to 123245 its reverse (542321), we get a palindrome (665566).

It can be divided in two parts, 123 and 245, that multiplied together give a triangular number (30135 = T_{245}).

The spelling of 123245 in words is "one hundred twenty-three thousand, two hundred forty-five".

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